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Showing results for tags 'modification'.
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Hi folks, I am new at AtariAge. Months ago, I've got an AV-modded european Atari 2600 Jr. (Rev. F board) in a great condition for cheap. However, here at my country (Brazil), PAL-B compatible TV sets are rare to find. The closest color system that is supported by most TVs is PAL-N (PAL variation used in Argentina and a few more countries in South America). I tried to replace the 4.433618 MHz XTAL with a 3.582056 MHz one, but that gave me no colors in any PAL-N compatible set. Also tried to replace the 3.546894 MHz one with a second 3.582056 MHz XTAL, but still gave me nothing but B&W picture. Is there something I can do to make this console output PAL-N? Both systems are 50 Hz and have the same resolution, so it should work somehow. Thanks a lot!
Hi all, I was given a 7800 a few years ago minus it's power adaptor. I recently did an experiment to allow it to work with another adaptor of the same rating, but modding the connection. I've made a video on my YouTube channel showing how I did it. Please leave any constructive comments ) Video: Best regards Steve
So I picked up a "non-working" CV from eBay ($25, bundled with 2 OEM controllers, power supply, and Illusions). The also-bundled RCA output cable was severed and frayed at the end. Powered on, tested all 4 connections, voltage checked out. No picture with replacement RCA (using a RCA-to-coaxial adapter; love those things). Concluded it was the RF modulator, so I decided to give Ben Heck's composite mod a try (http://www.benheck.com/Games/Coleco/Video_Mod.htm). It worked!...with two unexpected results (both may be unrelated to the mod, I'm not sure). 1. There is about a five-second delay after the console powers on, after which the ColecoVision title screen has about a three-second fade-in. After fade-in, the picture and colors are as clear and perfect as composite can give me. I'm using a 32" Toshiba CRT; all other consoles using composite output don't have this picture delay. The micro-potentiometer in my mod is turned up all the way. I should also point out that I tested the mod's circuit, and all components--including the video out--were getting the proper voltage (~12V DC). Is this a normal/typical "side effect" of the Ben Heck mod? Or is there something wrong/off with one of the components? 2. I noticed these stray, square sprites in fixed positions in a few of my games. (See attached pics for reference.) I first noticed a couple of them in the rivets stage of Donkey Kong... and then I saw a couple on the level start screen of Illusions.... It was then that I inferred they might be appearing in the same places regardless of the game, and that they won't appear on a black/"null" background. And then I put in Zaxxon.... Eureka! There looks to be a vertical row of these sprites, evenly spaced, across the entire height of the screen. Has anyone seen/solved this issue before? Thank you each for your time and help with this one. Love ya, appreciate ya.
I'm entering that danger zone of the afternoon mental wall, so please forgive me if this has been discussed ad nauseum on the forum to little or no avail... But has anyone ever entertained the notion of coming up with an Atari 8-bit API (Atari Peripherals Index) that mod developers could use to allow programmers to identify add-ins and modifications of any given computer...? I picture it in my head as some sort of index that would work during the boot process, when the DOS or OS would do a cursory check of a pre-determined index in memory somewhere once the mods/add-ins are initialized. Each device would have an assigned API ID that, if found, sends the DOS or OS over to a special table where it would find allocated memory usages, device ID, and any other relevant information that could become accessible to the programmer either through the API vector, or direct (and risk later incompatibilities). This would have the added advantage of allowing multiple add-ins play nice with each other since the index and table assigns/allocates their respective memory addresses. It'd be the closest thing to an Atari PNP operation, too. Just a random brainworm... --Tim